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Hello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.ello all, I have a Scrub Oak tree in my front yard, and I have St. Augustine underneath it. The grass is very thin and I was told that is because oak trees turn the soil acidic. I had lime put down last year but the grass still looks the same.
Other experts suggest adding gypsum to clay soil to improve drainage, leach salt from the ground and add calcium to the soil. The higher the calcium level, the more acidic the soil. And acidic soil is better for most plants. You wouldn't want your soil too acidic, however, warns Truesdell, or plant growth will suffer.